ICC Commercial Building Inspector Practice Test

What action must a fire door take when activated by a smoke detector?

1. Remain open

2. Close slowly

3. Self-closing

4. Lock automatically

The correct answer is: Self-closing

When activated by a smoke detector, a fire door must be self-closing. This function is critical as it helps to contain smoke and fire within specific areas of a building, preventing the rapid spread of flames and smoke to other parts of the structure. Self-closing fire doors are designed to automatically close when a smoke detector senses smoke, ensuring that a barrier is created to protect escape routes, reduce smoke movement, and safeguard occupants. This action is essential for maintaining the integrity of the fire-rated assemblies that are part of the building’s overall fire protection system. The requirement for fire doors to self-close is a vital aspect of maintaining safety standards in commercial buildings, as it supports overall evacuation strategies and mitigates risk during a fire event.